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#define _GNU_SOURCE
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "kexec.h"
#include "crashdump.h"
struct crash_note_info {
unsigned long base;
unsigned long length;
};
int xen_phys_cpus = 0;
struct crash_note_info *xen_phys_notes;
int xen_present(void)
{
struct stat buf;
return stat("/proc/xen", &buf) == 0;
}
static int xen_crash_note_callback(void *data, int nr,
char *str,
unsigned long base,
unsigned long length)
{
struct crash_note_info *note = xen_phys_notes + nr;
note->base = base;
note->length = length;
return 0;
}
int xen_get_nr_phys_cpus(void)
{
char *match = "Crash note\n";
int cpus, n;
if (xen_phys_cpus)
return xen_phys_cpus;
if ((cpus = kexec_iomem_for_each_line(match, NULL, NULL))) {
n = sizeof(struct crash_note_info) * cpus;
xen_phys_notes = malloc(n);
if (xen_phys_notes) {
memset(xen_phys_notes, 0, n);
kexec_iomem_for_each_line(match,
xen_crash_note_callback,
NULL);
}
xen_phys_cpus = cpus;
}
return cpus;
}
int xen_get_note(int cpu, uint64_t *addr, uint64_t *len)
{
struct crash_note_info *note;
if (xen_phys_cpus <= 0)
return -1;
note = xen_phys_notes + cpu;
*addr = note->base;
*len = note->length;
return 0;
}
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